SERVER-31165 added mismatched oplog entries to assert message

(cherry picked from commit 6475f004ad0db96d907e996dd24bad9a2228d3f6)

1 files changed, 5 insertions, 3 deletions

diff --git a/src/mongo/shell/replsettest.js b/src/mongo/shell/replsettest.js
index 6162c81f8dc..2516b2f8fac 100644
--- a/src/mongo/shell/replsettest.js
+++ b/src/mongo/shell/replsettest.js
@@ -1509,9 +1509,11 @@ var ReplSetTest = function(opts) {
                     if (!bsonBinaryEqual(oplogEntry, otherOplogEntry)) {
                         var query = prevOplogEntry ? {ts: {$lte: prevOplogEntry.ts}} : {};
                         rst.nodes.forEach(node => this.dumpOplog(node, query, 100));
-                        assert(false,
-                               msgPrefix + ", non-matching oplog entry for nodes: " +
-                                   firstReader.mongo.host + " " + readers[i].mongo.host);
+                        var log = msgPrefix +
+                            ", non-matching oplog entries for the following nodes: \n" +
+                            firstReader.mongo.host + ": " + tojsononeline(oplogEntry) + "\n" +
+                            readers[i].mongo.host + ": " + tojsononeline(otherOplogEntry);
+                        assert(false, log);
                     }
                 }
                 prevOplogEntry = oplogEntry;